A blood pressure of 108/79 falls within the normal range. Both the systolic (top) number and the diastolic (bottom) number land below the thresholds that define elevated or high blood pressure, making this a healthy reading for most adults.
Where 108/79 Falls on the Chart
The 2025 joint guidelines from the American Heart Association and American College of Cardiology define four blood pressure categories for adults:
- Normal: systolic below 120 and diastolic below 80
- Elevated: systolic 120 to 129 and diastolic below 80
- Hypertension Stage 1: systolic 130 to 139 or diastolic 80 to 89
- Hypertension Stage 2: systolic 140 or higher or diastolic 90 or higher
At 108/79, your systolic number sits comfortably in the normal zone, 12 points below the 120 cutoff. Your diastolic number is just one point under the 80 threshold. That single point matters: once diastolic hits 80, the reading crosses into Stage 1 hypertension territory regardless of the systolic number. So while 108/79 is normal, it’s worth keeping an eye on that lower number over time.
Your Pulse Pressure Looks Fine Too
Pulse pressure is the gap between your top and bottom numbers. For a reading of 108/79, that gap is 29. A healthy pulse pressure is generally around 40, and readings above 60 start to become a risk factor for heart disease, particularly in older adults. A pulse pressure of 29 is on the low side of normal but not a concern on its own. It simply reflects that the difference between the force when your heart pumps and when it rests is relatively narrow.
Why One Reading Isn’t the Full Picture
Blood pressure fluctuates throughout the day based on what you’ve eaten, how you’re sitting, and even how stressed you feel. Caffeine, alcohol, and exercise within 30 minutes of a reading can push numbers higher. Crossing your legs or letting your arm hang at your side instead of resting it on a table at chest height also inflates results. Even nervousness at a doctor’s office, sometimes called “white coat syndrome,” affects roughly 1 in 3 people who get high readings in clinical settings.
The official guidelines note that blood pressure categories are based on the average of two or more careful readings taken on two or more separate occasions. A single measurement of 108/79 is reassuring, but the pattern across multiple readings is what actually defines your blood pressure status.
For the most accurate home readings, avoid food, drinks, and exercise for 30 minutes beforehand. Sit with your back supported and feet flat on the floor for at least five minutes. Place the cuff on bare skin at chest height, and don’t talk during the measurement.
Is 108 Too Low?
Some people wonder whether a systolic reading in the low 100s edges toward low blood pressure. Clinically, low blood pressure (hypotension) is defined as below 90/60. At 108/79, you’re well above that threshold. Many people naturally run on the lower end of normal and feel perfectly fine.
Low blood pressure only becomes a problem when it causes symptoms: dizziness, lightheadedness, fainting, blurry vision, unusual fatigue, or nausea. If you experience none of these, a systolic reading of 108 is simply a sign that your cardiovascular system isn’t under excess strain. It’s a good thing.
Keeping Your Numbers in This Range
Normal blood pressure doesn’t stay normal automatically, especially with age. A few habits protect the reading you have now. Aim for at least 30 minutes of moderate physical activity most days. Walking, cycling, and swimming all count. Keep sodium intake below 2,300 milligrams per day, roughly one teaspoon of table salt. For even greater benefit, staying under 1,500 milligrams is ideal for most adults. Maintaining a healthy weight, limiting alcohol, and managing stress round out the lifestyle factors with the strongest evidence behind them.
Since your diastolic number is sitting right at the edge of normal, periodic monitoring is a smart move. Checking at home every few months, or at routine medical visits, helps you catch any upward trend early, long before it becomes a clinical issue.